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H
Hallucinogen

A substance that produces as a main effect perceptual distortions, especially visual and auditory. The effects can also extend beyond perceptions to changes of thought, mood and personality integration (self-awareness).The term is somewhat misleading as the hallucinogenic substances do not generally cause true hallucinations (i.e. sensory perceptions in the absence of external stimuli). However, the term is widely accepted by the scientific community.

EMCDDA Drug profiles glossary